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96cb8e33 PM |
1 | /* |
2 | * NetLabel CIPSO/IPv4 Support | |
3 | * | |
4 | * This file defines the CIPSO/IPv4 functions for the NetLabel system. The | |
5 | * NetLabel system manages static and dynamic label mappings for network | |
6 | * protocols such as CIPSO and RIPSO. | |
7 | * | |
8 | * Author: Paul Moore <paul.moore@hp.com> | |
9 | * | |
10 | */ | |
11 | ||
12 | /* | |
13 | * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 | |
14 | * | |
15 | * This program is free software; you can redistribute it and/or modify | |
16 | * it under the terms of the GNU General Public License as published by | |
17 | * the Free Software Foundation; either version 2 of the License, or | |
18 | * (at your option) any later version. | |
19 | * | |
20 | * This program is distributed in the hope that it will be useful, | |
21 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
23 | * the GNU General Public License for more details. | |
24 | * | |
25 | * You should have received a copy of the GNU General Public License | |
26 | * along with this program; if not, write to the Free Software | |
27 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
28 | * | |
29 | */ | |
30 | ||
31 | #include <linux/types.h> | |
32 | #include <linux/socket.h> | |
33 | #include <linux/string.h> | |
34 | #include <linux/skbuff.h> | |
32f50cde | 35 | #include <linux/audit.h> |
96cb8e33 PM |
36 | #include <net/sock.h> |
37 | #include <net/netlink.h> | |
38 | #include <net/genetlink.h> | |
39 | #include <net/netlabel.h> | |
40 | #include <net/cipso_ipv4.h> | |
41 | ||
42 | #include "netlabel_user.h" | |
43 | #include "netlabel_cipso_v4.h" | |
44 | ||
fd385855 PM |
45 | /* Argument struct for cipso_v4_doi_walk() */ |
46 | struct netlbl_cipsov4_doiwalk_arg { | |
47 | struct netlink_callback *nl_cb; | |
48 | struct sk_buff *skb; | |
49 | u32 seq; | |
50 | }; | |
51 | ||
96cb8e33 PM |
52 | /* NetLabel Generic NETLINK CIPSOv4 family */ |
53 | static struct genl_family netlbl_cipsov4_gnl_family = { | |
54 | .id = GENL_ID_GENERATE, | |
55 | .hdrsize = 0, | |
56 | .name = NETLBL_NLTYPE_CIPSOV4_NAME, | |
57 | .version = NETLBL_PROTO_VERSION, | |
fd385855 | 58 | .maxattr = NLBL_CIPSOV4_A_MAX, |
96cb8e33 PM |
59 | }; |
60 | ||
fd385855 PM |
61 | /* NetLabel Netlink attribute policy */ |
62 | static struct nla_policy netlbl_cipsov4_genl_policy[NLBL_CIPSOV4_A_MAX + 1] = { | |
63 | [NLBL_CIPSOV4_A_DOI] = { .type = NLA_U32 }, | |
64 | [NLBL_CIPSOV4_A_MTYPE] = { .type = NLA_U32 }, | |
65 | [NLBL_CIPSOV4_A_TAG] = { .type = NLA_U8 }, | |
66 | [NLBL_CIPSOV4_A_TAGLST] = { .type = NLA_NESTED }, | |
67 | [NLBL_CIPSOV4_A_MLSLVLLOC] = { .type = NLA_U32 }, | |
68 | [NLBL_CIPSOV4_A_MLSLVLREM] = { .type = NLA_U32 }, | |
69 | [NLBL_CIPSOV4_A_MLSLVL] = { .type = NLA_NESTED }, | |
70 | [NLBL_CIPSOV4_A_MLSLVLLST] = { .type = NLA_NESTED }, | |
71 | [NLBL_CIPSOV4_A_MLSCATLOC] = { .type = NLA_U32 }, | |
72 | [NLBL_CIPSOV4_A_MLSCATREM] = { .type = NLA_U32 }, | |
73 | [NLBL_CIPSOV4_A_MLSCAT] = { .type = NLA_NESTED }, | |
74 | [NLBL_CIPSOV4_A_MLSCATLST] = { .type = NLA_NESTED }, | |
75 | }; | |
96cb8e33 PM |
76 | |
77 | /* | |
78 | * Helper Functions | |
79 | */ | |
80 | ||
81 | /** | |
82 | * netlbl_cipsov4_doi_free - Frees a CIPSO V4 DOI definition | |
83 | * @entry: the entry's RCU field | |
84 | * | |
85 | * Description: | |
86 | * This function is designed to be used as a callback to the call_rcu() | |
87 | * function so that the memory allocated to the DOI definition can be released | |
88 | * safely. | |
89 | * | |
90 | */ | |
91 | static void netlbl_cipsov4_doi_free(struct rcu_head *entry) | |
92 | { | |
93 | struct cipso_v4_doi *ptr; | |
94 | ||
95 | ptr = container_of(entry, struct cipso_v4_doi, rcu); | |
96 | switch (ptr->type) { | |
97 | case CIPSO_V4_MAP_STD: | |
98 | kfree(ptr->map.std->lvl.cipso); | |
99 | kfree(ptr->map.std->lvl.local); | |
100 | kfree(ptr->map.std->cat.cipso); | |
101 | kfree(ptr->map.std->cat.local); | |
102 | break; | |
103 | } | |
104 | kfree(ptr); | |
105 | } | |
106 | ||
fd385855 PM |
107 | /** |
108 | * netlbl_cipsov4_add_common - Parse the common sections of a ADD message | |
109 | * @info: the Generic NETLINK info block | |
110 | * @doi_def: the CIPSO V4 DOI definition | |
111 | * | |
112 | * Description: | |
113 | * Parse the common sections of a ADD message and fill in the related values | |
114 | * in @doi_def. Returns zero on success, negative values on failure. | |
115 | * | |
116 | */ | |
117 | static int netlbl_cipsov4_add_common(struct genl_info *info, | |
118 | struct cipso_v4_doi *doi_def) | |
119 | { | |
120 | struct nlattr *nla; | |
121 | int nla_rem; | |
122 | u32 iter = 0; | |
123 | ||
124 | doi_def->doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]); | |
125 | ||
126 | if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_TAGLST], | |
127 | NLBL_CIPSOV4_A_MAX, | |
128 | netlbl_cipsov4_genl_policy) != 0) | |
129 | return -EINVAL; | |
130 | ||
131 | nla_for_each_nested(nla, info->attrs[NLBL_CIPSOV4_A_TAGLST], nla_rem) | |
132 | if (nla->nla_type == NLBL_CIPSOV4_A_TAG) { | |
133 | if (iter > CIPSO_V4_TAG_MAXCNT) | |
134 | return -EINVAL; | |
135 | doi_def->tags[iter++] = nla_get_u8(nla); | |
136 | } | |
137 | if (iter < CIPSO_V4_TAG_MAXCNT) | |
138 | doi_def->tags[iter] = CIPSO_V4_TAG_INVALID; | |
139 | ||
140 | return 0; | |
141 | } | |
96cb8e33 PM |
142 | |
143 | /* | |
144 | * NetLabel Command Handlers | |
145 | */ | |
146 | ||
147 | /** | |
148 | * netlbl_cipsov4_add_std - Adds a CIPSO V4 DOI definition | |
fd385855 | 149 | * @info: the Generic NETLINK info block |
96cb8e33 PM |
150 | * |
151 | * Description: | |
152 | * Create a new CIPSO_V4_MAP_STD DOI definition based on the given ADD message | |
153 | * and add it to the CIPSO V4 engine. Return zero on success and non-zero on | |
154 | * error. | |
155 | * | |
156 | */ | |
fd385855 | 157 | static int netlbl_cipsov4_add_std(struct genl_info *info) |
96cb8e33 PM |
158 | { |
159 | int ret_val = -EINVAL; | |
96cb8e33 | 160 | struct cipso_v4_doi *doi_def = NULL; |
fd385855 PM |
161 | struct nlattr *nla_a; |
162 | struct nlattr *nla_b; | |
163 | int nla_a_rem; | |
164 | int nla_b_rem; | |
caff5b6a | 165 | u32 iter; |
96cb8e33 | 166 | |
32f50cde | 167 | if (!info->attrs[NLBL_CIPSOV4_A_TAGLST] || |
fd385855 PM |
168 | !info->attrs[NLBL_CIPSOV4_A_MLSLVLLST]) |
169 | return -EINVAL; | |
170 | ||
171 | if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_MLSLVLLST], | |
172 | NLBL_CIPSOV4_A_MAX, | |
173 | netlbl_cipsov4_genl_policy) != 0) | |
174 | return -EINVAL; | |
96cb8e33 PM |
175 | |
176 | doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL); | |
fd385855 PM |
177 | if (doi_def == NULL) |
178 | return -ENOMEM; | |
96cb8e33 PM |
179 | doi_def->map.std = kzalloc(sizeof(*doi_def->map.std), GFP_KERNEL); |
180 | if (doi_def->map.std == NULL) { | |
181 | ret_val = -ENOMEM; | |
182 | goto add_std_failure; | |
183 | } | |
184 | doi_def->type = CIPSO_V4_MAP_STD; | |
185 | ||
fd385855 PM |
186 | ret_val = netlbl_cipsov4_add_common(info, doi_def); |
187 | if (ret_val != 0) | |
96cb8e33 | 188 | goto add_std_failure; |
1fd2a25b | 189 | ret_val = -EINVAL; |
96cb8e33 | 190 | |
fd385855 PM |
191 | nla_for_each_nested(nla_a, |
192 | info->attrs[NLBL_CIPSOV4_A_MLSLVLLST], | |
193 | nla_a_rem) | |
194 | if (nla_a->nla_type == NLBL_CIPSOV4_A_MLSLVL) { | |
1fd2a25b PM |
195 | if (nla_validate_nested(nla_a, |
196 | NLBL_CIPSOV4_A_MAX, | |
197 | netlbl_cipsov4_genl_policy) != 0) | |
198 | goto add_std_failure; | |
fd385855 PM |
199 | nla_for_each_nested(nla_b, nla_a, nla_b_rem) |
200 | switch (nla_b->nla_type) { | |
201 | case NLBL_CIPSOV4_A_MLSLVLLOC: | |
1fd2a25b PM |
202 | if (nla_get_u32(nla_b) > |
203 | CIPSO_V4_MAX_LOC_LVLS) | |
204 | goto add_std_failure; | |
fd385855 PM |
205 | if (nla_get_u32(nla_b) >= |
206 | doi_def->map.std->lvl.local_size) | |
207 | doi_def->map.std->lvl.local_size = | |
208 | nla_get_u32(nla_b) + 1; | |
209 | break; | |
210 | case NLBL_CIPSOV4_A_MLSLVLREM: | |
1fd2a25b PM |
211 | if (nla_get_u32(nla_b) > |
212 | CIPSO_V4_MAX_REM_LVLS) | |
213 | goto add_std_failure; | |
fd385855 PM |
214 | if (nla_get_u32(nla_b) >= |
215 | doi_def->map.std->lvl.cipso_size) | |
216 | doi_def->map.std->lvl.cipso_size = | |
217 | nla_get_u32(nla_b) + 1; | |
218 | break; | |
219 | } | |
220 | } | |
96cb8e33 PM |
221 | doi_def->map.std->lvl.local = kcalloc(doi_def->map.std->lvl.local_size, |
222 | sizeof(u32), | |
223 | GFP_KERNEL); | |
224 | if (doi_def->map.std->lvl.local == NULL) { | |
225 | ret_val = -ENOMEM; | |
226 | goto add_std_failure; | |
227 | } | |
96cb8e33 PM |
228 | doi_def->map.std->lvl.cipso = kcalloc(doi_def->map.std->lvl.cipso_size, |
229 | sizeof(u32), | |
230 | GFP_KERNEL); | |
231 | if (doi_def->map.std->lvl.cipso == NULL) { | |
232 | ret_val = -ENOMEM; | |
233 | goto add_std_failure; | |
234 | } | |
caff5b6a PM |
235 | for (iter = 0; iter < doi_def->map.std->lvl.local_size; iter++) |
236 | doi_def->map.std->lvl.local[iter] = CIPSO_V4_INV_LVL; | |
237 | for (iter = 0; iter < doi_def->map.std->lvl.cipso_size; iter++) | |
238 | doi_def->map.std->lvl.cipso[iter] = CIPSO_V4_INV_LVL; | |
fd385855 PM |
239 | nla_for_each_nested(nla_a, |
240 | info->attrs[NLBL_CIPSOV4_A_MLSLVLLST], | |
241 | nla_a_rem) | |
242 | if (nla_a->nla_type == NLBL_CIPSOV4_A_MLSLVL) { | |
243 | struct nlattr *lvl_loc; | |
244 | struct nlattr *lvl_rem; | |
245 | ||
fd385855 PM |
246 | lvl_loc = nla_find_nested(nla_a, |
247 | NLBL_CIPSOV4_A_MLSLVLLOC); | |
248 | lvl_rem = nla_find_nested(nla_a, | |
249 | NLBL_CIPSOV4_A_MLSLVLREM); | |
250 | if (lvl_loc == NULL || lvl_rem == NULL) | |
251 | goto add_std_failure; | |
252 | doi_def->map.std->lvl.local[nla_get_u32(lvl_loc)] = | |
253 | nla_get_u32(lvl_rem); | |
254 | doi_def->map.std->lvl.cipso[nla_get_u32(lvl_rem)] = | |
255 | nla_get_u32(lvl_loc); | |
256 | } | |
96cb8e33 | 257 | |
fd385855 PM |
258 | if (info->attrs[NLBL_CIPSOV4_A_MLSCATLST]) { |
259 | if (nla_validate_nested(info->attrs[NLBL_CIPSOV4_A_MLSCATLST], | |
260 | NLBL_CIPSOV4_A_MAX, | |
261 | netlbl_cipsov4_genl_policy) != 0) | |
262 | goto add_std_failure; | |
263 | ||
264 | nla_for_each_nested(nla_a, | |
265 | info->attrs[NLBL_CIPSOV4_A_MLSCATLST], | |
266 | nla_a_rem) | |
267 | if (nla_a->nla_type == NLBL_CIPSOV4_A_MLSCAT) { | |
268 | if (nla_validate_nested(nla_a, | |
269 | NLBL_CIPSOV4_A_MAX, | |
270 | netlbl_cipsov4_genl_policy) != 0) | |
271 | goto add_std_failure; | |
272 | nla_for_each_nested(nla_b, nla_a, nla_b_rem) | |
273 | switch (nla_b->nla_type) { | |
274 | case NLBL_CIPSOV4_A_MLSCATLOC: | |
1fd2a25b PM |
275 | if (nla_get_u32(nla_b) > |
276 | CIPSO_V4_MAX_LOC_CATS) | |
277 | goto add_std_failure; | |
fd385855 PM |
278 | if (nla_get_u32(nla_b) >= |
279 | doi_def->map.std->cat.local_size) | |
280 | doi_def->map.std->cat.local_size = | |
281 | nla_get_u32(nla_b) + 1; | |
282 | break; | |
283 | case NLBL_CIPSOV4_A_MLSCATREM: | |
1fd2a25b PM |
284 | if (nla_get_u32(nla_b) > |
285 | CIPSO_V4_MAX_REM_CATS) | |
286 | goto add_std_failure; | |
fd385855 PM |
287 | if (nla_get_u32(nla_b) >= |
288 | doi_def->map.std->cat.cipso_size) | |
289 | doi_def->map.std->cat.cipso_size = | |
290 | nla_get_u32(nla_b) + 1; | |
291 | break; | |
292 | } | |
293 | } | |
fd385855 PM |
294 | doi_def->map.std->cat.local = kcalloc( |
295 | doi_def->map.std->cat.local_size, | |
96cb8e33 PM |
296 | sizeof(u32), |
297 | GFP_KERNEL); | |
fd385855 PM |
298 | if (doi_def->map.std->cat.local == NULL) { |
299 | ret_val = -ENOMEM; | |
300 | goto add_std_failure; | |
301 | } | |
302 | doi_def->map.std->cat.cipso = kcalloc( | |
303 | doi_def->map.std->cat.cipso_size, | |
96cb8e33 PM |
304 | sizeof(u32), |
305 | GFP_KERNEL); | |
fd385855 PM |
306 | if (doi_def->map.std->cat.cipso == NULL) { |
307 | ret_val = -ENOMEM; | |
96cb8e33 | 308 | goto add_std_failure; |
fd385855 | 309 | } |
caff5b6a PM |
310 | for (iter = 0; iter < doi_def->map.std->cat.local_size; iter++) |
311 | doi_def->map.std->cat.local[iter] = CIPSO_V4_INV_CAT; | |
312 | for (iter = 0; iter < doi_def->map.std->cat.cipso_size; iter++) | |
313 | doi_def->map.std->cat.cipso[iter] = CIPSO_V4_INV_CAT; | |
fd385855 PM |
314 | nla_for_each_nested(nla_a, |
315 | info->attrs[NLBL_CIPSOV4_A_MLSCATLST], | |
316 | nla_a_rem) | |
317 | if (nla_a->nla_type == NLBL_CIPSOV4_A_MLSCAT) { | |
318 | struct nlattr *cat_loc; | |
319 | struct nlattr *cat_rem; | |
320 | ||
321 | cat_loc = nla_find_nested(nla_a, | |
322 | NLBL_CIPSOV4_A_MLSCATLOC); | |
323 | cat_rem = nla_find_nested(nla_a, | |
324 | NLBL_CIPSOV4_A_MLSCATREM); | |
325 | if (cat_loc == NULL || cat_rem == NULL) | |
326 | goto add_std_failure; | |
327 | doi_def->map.std->cat.local[ | |
328 | nla_get_u32(cat_loc)] = | |
329 | nla_get_u32(cat_rem); | |
330 | doi_def->map.std->cat.cipso[ | |
331 | nla_get_u32(cat_rem)] = | |
332 | nla_get_u32(cat_loc); | |
333 | } | |
96cb8e33 PM |
334 | } |
335 | ||
96cb8e33 PM |
336 | ret_val = cipso_v4_doi_add(doi_def); |
337 | if (ret_val != 0) | |
338 | goto add_std_failure; | |
339 | return 0; | |
340 | ||
341 | add_std_failure: | |
342 | if (doi_def) | |
343 | netlbl_cipsov4_doi_free(&doi_def->rcu); | |
344 | return ret_val; | |
345 | } | |
346 | ||
347 | /** | |
348 | * netlbl_cipsov4_add_pass - Adds a CIPSO V4 DOI definition | |
fd385855 | 349 | * @info: the Generic NETLINK info block |
96cb8e33 PM |
350 | * |
351 | * Description: | |
352 | * Create a new CIPSO_V4_MAP_PASS DOI definition based on the given ADD message | |
353 | * and add it to the CIPSO V4 engine. Return zero on success and non-zero on | |
354 | * error. | |
355 | * | |
356 | */ | |
fd385855 | 357 | static int netlbl_cipsov4_add_pass(struct genl_info *info) |
96cb8e33 | 358 | { |
fd385855 | 359 | int ret_val; |
96cb8e33 | 360 | struct cipso_v4_doi *doi_def = NULL; |
96cb8e33 | 361 | |
32f50cde | 362 | if (!info->attrs[NLBL_CIPSOV4_A_TAGLST]) |
fd385855 | 363 | return -EINVAL; |
96cb8e33 PM |
364 | |
365 | doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL); | |
fd385855 PM |
366 | if (doi_def == NULL) |
367 | return -ENOMEM; | |
96cb8e33 PM |
368 | doi_def->type = CIPSO_V4_MAP_PASS; |
369 | ||
fd385855 PM |
370 | ret_val = netlbl_cipsov4_add_common(info, doi_def); |
371 | if (ret_val != 0) | |
372 | goto add_pass_failure; | |
96cb8e33 | 373 | |
96cb8e33 PM |
374 | ret_val = cipso_v4_doi_add(doi_def); |
375 | if (ret_val != 0) | |
376 | goto add_pass_failure; | |
377 | return 0; | |
378 | ||
379 | add_pass_failure: | |
fd385855 | 380 | netlbl_cipsov4_doi_free(&doi_def->rcu); |
96cb8e33 PM |
381 | return ret_val; |
382 | } | |
383 | ||
384 | /** | |
385 | * netlbl_cipsov4_add - Handle an ADD message | |
386 | * @skb: the NETLINK buffer | |
387 | * @info: the Generic NETLINK info block | |
388 | * | |
389 | * Description: | |
390 | * Create a new DOI definition based on the given ADD message and add it to the | |
391 | * CIPSO V4 engine. Returns zero on success, negative values on failure. | |
392 | * | |
393 | */ | |
394 | static int netlbl_cipsov4_add(struct sk_buff *skb, struct genl_info *info) | |
395 | ||
396 | { | |
397 | int ret_val = -EINVAL; | |
32f50cde PM |
398 | u32 type; |
399 | u32 doi; | |
400 | const char *type_str = "(unknown)"; | |
401 | struct audit_buffer *audit_buf; | |
95d4e6be | 402 | struct netlbl_audit audit_info; |
96cb8e33 | 403 | |
32f50cde PM |
404 | if (!info->attrs[NLBL_CIPSOV4_A_DOI] || |
405 | !info->attrs[NLBL_CIPSOV4_A_MTYPE]) | |
fd385855 | 406 | return -EINVAL; |
96cb8e33 | 407 | |
95d4e6be PM |
408 | doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]); |
409 | netlbl_netlink_auditinfo(skb, &audit_info); | |
410 | ||
32f50cde PM |
411 | type = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_MTYPE]); |
412 | switch (type) { | |
96cb8e33 | 413 | case CIPSO_V4_MAP_STD: |
32f50cde | 414 | type_str = "std"; |
fd385855 | 415 | ret_val = netlbl_cipsov4_add_std(info); |
96cb8e33 PM |
416 | break; |
417 | case CIPSO_V4_MAP_PASS: | |
32f50cde | 418 | type_str = "pass"; |
fd385855 | 419 | ret_val = netlbl_cipsov4_add_pass(info); |
96cb8e33 PM |
420 | break; |
421 | } | |
422 | ||
95d4e6be PM |
423 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_CIPSOV4_ADD, |
424 | &audit_info); | |
de64688f PM |
425 | if (audit_buf != NULL) { |
426 | audit_log_format(audit_buf, | |
427 | " cipso_doi=%u cipso_type=%s res=%u", | |
428 | doi, | |
429 | type_str, | |
430 | ret_val == 0 ? 1 : 0); | |
431 | audit_log_end(audit_buf); | |
432 | } | |
32f50cde | 433 | |
96cb8e33 PM |
434 | return ret_val; |
435 | } | |
436 | ||
437 | /** | |
438 | * netlbl_cipsov4_list - Handle a LIST message | |
439 | * @skb: the NETLINK buffer | |
440 | * @info: the Generic NETLINK info block | |
441 | * | |
442 | * Description: | |
fd385855 PM |
443 | * Process a user generated LIST message and respond accordingly. While the |
444 | * response message generated by the kernel is straightforward, determining | |
445 | * before hand the size of the buffer to allocate is not (we have to generate | |
446 | * the message to know the size). In order to keep this function sane what we | |
447 | * do is allocate a buffer of NLMSG_GOODSIZE and try to fit the response in | |
448 | * that size, if we fail then we restart with a larger buffer and try again. | |
449 | * We continue in this manner until we hit a limit of failed attempts then we | |
450 | * give up and just send an error message. Returns zero on success and | |
451 | * negative values on error. | |
96cb8e33 PM |
452 | * |
453 | */ | |
454 | static int netlbl_cipsov4_list(struct sk_buff *skb, struct genl_info *info) | |
455 | { | |
fd385855 PM |
456 | int ret_val; |
457 | struct sk_buff *ans_skb = NULL; | |
458 | u32 nlsze_mult = 1; | |
459 | void *data; | |
96cb8e33 | 460 | u32 doi; |
fd385855 PM |
461 | struct nlattr *nla_a; |
462 | struct nlattr *nla_b; | |
463 | struct cipso_v4_doi *doi_def; | |
464 | u32 iter; | |
96cb8e33 | 465 | |
fd385855 PM |
466 | if (!info->attrs[NLBL_CIPSOV4_A_DOI]) { |
467 | ret_val = -EINVAL; | |
96cb8e33 | 468 | goto list_failure; |
fd385855 | 469 | } |
96cb8e33 | 470 | |
fd385855 | 471 | list_start: |
339bf98f | 472 | ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE * nlsze_mult, GFP_KERNEL); |
96cb8e33 PM |
473 | if (ans_skb == NULL) { |
474 | ret_val = -ENOMEM; | |
475 | goto list_failure; | |
476 | } | |
17c157c8 TG |
477 | data = genlmsg_put_reply(ans_skb, info, &netlbl_cipsov4_gnl_family, |
478 | 0, NLBL_CIPSOV4_C_LIST); | |
fd385855 PM |
479 | if (data == NULL) { |
480 | ret_val = -ENOMEM; | |
481 | goto list_failure; | |
482 | } | |
483 | ||
484 | doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]); | |
485 | ||
486 | rcu_read_lock(); | |
487 | doi_def = cipso_v4_doi_getdef(doi); | |
488 | if (doi_def == NULL) { | |
489 | ret_val = -EINVAL; | |
490 | goto list_failure; | |
491 | } | |
492 | ||
493 | ret_val = nla_put_u32(ans_skb, NLBL_CIPSOV4_A_MTYPE, doi_def->type); | |
494 | if (ret_val != 0) | |
495 | goto list_failure_lock; | |
496 | ||
497 | nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_TAGLST); | |
498 | if (nla_a == NULL) { | |
499 | ret_val = -ENOMEM; | |
500 | goto list_failure_lock; | |
501 | } | |
502 | for (iter = 0; | |
503 | iter < CIPSO_V4_TAG_MAXCNT && | |
504 | doi_def->tags[iter] != CIPSO_V4_TAG_INVALID; | |
505 | iter++) { | |
506 | ret_val = nla_put_u8(ans_skb, | |
507 | NLBL_CIPSOV4_A_TAG, | |
508 | doi_def->tags[iter]); | |
509 | if (ret_val != 0) | |
510 | goto list_failure_lock; | |
511 | } | |
512 | nla_nest_end(ans_skb, nla_a); | |
513 | ||
514 | switch (doi_def->type) { | |
515 | case CIPSO_V4_MAP_STD: | |
516 | nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSLVLLST); | |
517 | if (nla_a == NULL) { | |
518 | ret_val = -ENOMEM; | |
519 | goto list_failure_lock; | |
520 | } | |
521 | for (iter = 0; | |
522 | iter < doi_def->map.std->lvl.local_size; | |
523 | iter++) { | |
524 | if (doi_def->map.std->lvl.local[iter] == | |
525 | CIPSO_V4_INV_LVL) | |
526 | continue; | |
527 | ||
528 | nla_b = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSLVL); | |
529 | if (nla_b == NULL) { | |
530 | ret_val = -ENOMEM; | |
531 | goto list_retry; | |
532 | } | |
533 | ret_val = nla_put_u32(ans_skb, | |
534 | NLBL_CIPSOV4_A_MLSLVLLOC, | |
535 | iter); | |
536 | if (ret_val != 0) | |
537 | goto list_retry; | |
538 | ret_val = nla_put_u32(ans_skb, | |
539 | NLBL_CIPSOV4_A_MLSLVLREM, | |
540 | doi_def->map.std->lvl.local[iter]); | |
541 | if (ret_val != 0) | |
542 | goto list_retry; | |
543 | nla_nest_end(ans_skb, nla_b); | |
544 | } | |
545 | nla_nest_end(ans_skb, nla_a); | |
546 | ||
547 | nla_a = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSCATLST); | |
548 | if (nla_a == NULL) { | |
549 | ret_val = -ENOMEM; | |
550 | goto list_retry; | |
551 | } | |
552 | for (iter = 0; | |
553 | iter < doi_def->map.std->cat.local_size; | |
554 | iter++) { | |
555 | if (doi_def->map.std->cat.local[iter] == | |
556 | CIPSO_V4_INV_CAT) | |
557 | continue; | |
558 | ||
559 | nla_b = nla_nest_start(ans_skb, NLBL_CIPSOV4_A_MLSCAT); | |
560 | if (nla_b == NULL) { | |
561 | ret_val = -ENOMEM; | |
562 | goto list_retry; | |
563 | } | |
564 | ret_val = nla_put_u32(ans_skb, | |
565 | NLBL_CIPSOV4_A_MLSCATLOC, | |
566 | iter); | |
567 | if (ret_val != 0) | |
568 | goto list_retry; | |
569 | ret_val = nla_put_u32(ans_skb, | |
570 | NLBL_CIPSOV4_A_MLSCATREM, | |
571 | doi_def->map.std->cat.local[iter]); | |
572 | if (ret_val != 0) | |
573 | goto list_retry; | |
574 | nla_nest_end(ans_skb, nla_b); | |
575 | } | |
576 | nla_nest_end(ans_skb, nla_a); | |
577 | ||
578 | break; | |
579 | } | |
580 | rcu_read_unlock(); | |
96cb8e33 | 581 | |
fd385855 PM |
582 | genlmsg_end(ans_skb, data); |
583 | ||
81878d27 | 584 | ret_val = genlmsg_reply(ans_skb, info); |
96cb8e33 PM |
585 | if (ret_val != 0) |
586 | goto list_failure; | |
587 | ||
588 | return 0; | |
589 | ||
fd385855 PM |
590 | list_retry: |
591 | /* XXX - this limit is a guesstimate */ | |
592 | if (nlsze_mult < 4) { | |
593 | rcu_read_unlock(); | |
594 | kfree_skb(ans_skb); | |
595 | nlsze_mult++; | |
596 | goto list_start; | |
597 | } | |
598 | list_failure_lock: | |
599 | rcu_read_unlock(); | |
96cb8e33 | 600 | list_failure: |
fd385855 PM |
601 | kfree_skb(ans_skb); |
602 | return ret_val; | |
603 | } | |
604 | ||
605 | /** | |
606 | * netlbl_cipsov4_listall_cb - cipso_v4_doi_walk() callback for LISTALL | |
607 | * @doi_def: the CIPSOv4 DOI definition | |
608 | * @arg: the netlbl_cipsov4_doiwalk_arg structure | |
609 | * | |
610 | * Description: | |
611 | * This function is designed to be used as a callback to the | |
612 | * cipso_v4_doi_walk() function for use in generating a response for a LISTALL | |
613 | * message. Returns the size of the message on success, negative values on | |
614 | * failure. | |
615 | * | |
616 | */ | |
617 | static int netlbl_cipsov4_listall_cb(struct cipso_v4_doi *doi_def, void *arg) | |
618 | { | |
619 | int ret_val = -ENOMEM; | |
620 | struct netlbl_cipsov4_doiwalk_arg *cb_arg = arg; | |
621 | void *data; | |
622 | ||
17c157c8 TG |
623 | data = genlmsg_put(cb_arg->skb, NETLINK_CB(cb_arg->nl_cb->skb).pid, |
624 | cb_arg->seq, &netlbl_cipsov4_gnl_family, | |
625 | NLM_F_MULTI, NLBL_CIPSOV4_C_LISTALL); | |
fd385855 PM |
626 | if (data == NULL) |
627 | goto listall_cb_failure; | |
628 | ||
629 | ret_val = nla_put_u32(cb_arg->skb, NLBL_CIPSOV4_A_DOI, doi_def->doi); | |
630 | if (ret_val != 0) | |
631 | goto listall_cb_failure; | |
632 | ret_val = nla_put_u32(cb_arg->skb, | |
633 | NLBL_CIPSOV4_A_MTYPE, | |
634 | doi_def->type); | |
635 | if (ret_val != 0) | |
636 | goto listall_cb_failure; | |
637 | ||
638 | return genlmsg_end(cb_arg->skb, data); | |
639 | ||
640 | listall_cb_failure: | |
641 | genlmsg_cancel(cb_arg->skb, data); | |
96cb8e33 PM |
642 | return ret_val; |
643 | } | |
644 | ||
645 | /** | |
646 | * netlbl_cipsov4_listall - Handle a LISTALL message | |
647 | * @skb: the NETLINK buffer | |
fd385855 | 648 | * @cb: the NETLINK callback |
96cb8e33 PM |
649 | * |
650 | * Description: | |
651 | * Process a user generated LISTALL message and respond accordingly. Returns | |
652 | * zero on success and negative values on error. | |
653 | * | |
654 | */ | |
fd385855 PM |
655 | static int netlbl_cipsov4_listall(struct sk_buff *skb, |
656 | struct netlink_callback *cb) | |
96cb8e33 | 657 | { |
fd385855 PM |
658 | struct netlbl_cipsov4_doiwalk_arg cb_arg; |
659 | int doi_skip = cb->args[0]; | |
96cb8e33 | 660 | |
fd385855 PM |
661 | cb_arg.nl_cb = cb; |
662 | cb_arg.skb = skb; | |
663 | cb_arg.seq = cb->nlh->nlmsg_seq; | |
96cb8e33 | 664 | |
fd385855 | 665 | cipso_v4_doi_walk(&doi_skip, netlbl_cipsov4_listall_cb, &cb_arg); |
96cb8e33 | 666 | |
fd385855 PM |
667 | cb->args[0] = doi_skip; |
668 | return skb->len; | |
96cb8e33 PM |
669 | } |
670 | ||
671 | /** | |
672 | * netlbl_cipsov4_remove - Handle a REMOVE message | |
673 | * @skb: the NETLINK buffer | |
674 | * @info: the Generic NETLINK info block | |
675 | * | |
676 | * Description: | |
677 | * Process a user generated REMOVE message and respond accordingly. Returns | |
678 | * zero on success, negative values on failure. | |
679 | * | |
680 | */ | |
681 | static int netlbl_cipsov4_remove(struct sk_buff *skb, struct genl_info *info) | |
682 | { | |
fd385855 | 683 | int ret_val = -EINVAL; |
32f50cde PM |
684 | u32 doi = 0; |
685 | struct audit_buffer *audit_buf; | |
95d4e6be | 686 | struct netlbl_audit audit_info; |
96cb8e33 | 687 | |
95d4e6be PM |
688 | if (!info->attrs[NLBL_CIPSOV4_A_DOI]) |
689 | return -EINVAL; | |
32f50cde | 690 | |
95d4e6be PM |
691 | doi = nla_get_u32(info->attrs[NLBL_CIPSOV4_A_DOI]); |
692 | netlbl_netlink_auditinfo(skb, &audit_info); | |
693 | ||
694 | ret_val = cipso_v4_doi_remove(doi, | |
695 | &audit_info, | |
696 | netlbl_cipsov4_doi_free); | |
697 | ||
698 | audit_buf = netlbl_audit_start_common(AUDIT_MAC_CIPSOV4_DEL, | |
699 | &audit_info); | |
de64688f PM |
700 | if (audit_buf != NULL) { |
701 | audit_log_format(audit_buf, | |
702 | " cipso_doi=%u res=%u", | |
703 | doi, | |
704 | ret_val == 0 ? 1 : 0); | |
705 | audit_log_end(audit_buf); | |
706 | } | |
96cb8e33 | 707 | |
96cb8e33 PM |
708 | return ret_val; |
709 | } | |
710 | ||
711 | /* | |
712 | * NetLabel Generic NETLINK Command Definitions | |
713 | */ | |
714 | ||
715 | static struct genl_ops netlbl_cipsov4_genl_c_add = { | |
716 | .cmd = NLBL_CIPSOV4_C_ADD, | |
fd385855 PM |
717 | .flags = GENL_ADMIN_PERM, |
718 | .policy = netlbl_cipsov4_genl_policy, | |
96cb8e33 PM |
719 | .doit = netlbl_cipsov4_add, |
720 | .dumpit = NULL, | |
721 | }; | |
722 | ||
723 | static struct genl_ops netlbl_cipsov4_genl_c_remove = { | |
724 | .cmd = NLBL_CIPSOV4_C_REMOVE, | |
fd385855 PM |
725 | .flags = GENL_ADMIN_PERM, |
726 | .policy = netlbl_cipsov4_genl_policy, | |
96cb8e33 PM |
727 | .doit = netlbl_cipsov4_remove, |
728 | .dumpit = NULL, | |
729 | }; | |
730 | ||
731 | static struct genl_ops netlbl_cipsov4_genl_c_list = { | |
732 | .cmd = NLBL_CIPSOV4_C_LIST, | |
733 | .flags = 0, | |
fd385855 | 734 | .policy = netlbl_cipsov4_genl_policy, |
96cb8e33 PM |
735 | .doit = netlbl_cipsov4_list, |
736 | .dumpit = NULL, | |
737 | }; | |
738 | ||
739 | static struct genl_ops netlbl_cipsov4_genl_c_listall = { | |
740 | .cmd = NLBL_CIPSOV4_C_LISTALL, | |
741 | .flags = 0, | |
fd385855 PM |
742 | .policy = netlbl_cipsov4_genl_policy, |
743 | .doit = NULL, | |
744 | .dumpit = netlbl_cipsov4_listall, | |
96cb8e33 PM |
745 | }; |
746 | ||
747 | /* | |
748 | * NetLabel Generic NETLINK Protocol Functions | |
749 | */ | |
750 | ||
751 | /** | |
752 | * netlbl_cipsov4_genl_init - Register the CIPSOv4 NetLabel component | |
753 | * | |
754 | * Description: | |
755 | * Register the CIPSOv4 packet NetLabel component with the Generic NETLINK | |
756 | * mechanism. Returns zero on success, negative values on failure. | |
757 | * | |
758 | */ | |
759 | int netlbl_cipsov4_genl_init(void) | |
760 | { | |
761 | int ret_val; | |
762 | ||
763 | ret_val = genl_register_family(&netlbl_cipsov4_gnl_family); | |
764 | if (ret_val != 0) | |
765 | return ret_val; | |
766 | ||
767 | ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family, | |
768 | &netlbl_cipsov4_genl_c_add); | |
769 | if (ret_val != 0) | |
770 | return ret_val; | |
771 | ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family, | |
772 | &netlbl_cipsov4_genl_c_remove); | |
773 | if (ret_val != 0) | |
774 | return ret_val; | |
775 | ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family, | |
776 | &netlbl_cipsov4_genl_c_list); | |
777 | if (ret_val != 0) | |
778 | return ret_val; | |
779 | ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family, | |
780 | &netlbl_cipsov4_genl_c_listall); | |
781 | if (ret_val != 0) | |
782 | return ret_val; | |
783 | ||
784 | return 0; | |
785 | } |